JP2826847B2 - Method for forming valve chamber of cylinder member for liquid ejector - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a valve chamber for suction of a cylinder member used in, for example, a small manual sprayer or a foam ejector.

"Prior art" The above-mentioned cylinder member is provided so that an outward flange attached to the upper end of the cylinder portion is engaged with the top surface of the liquid storage container body mouth and hangs down into the container body. From above, the liquid suction pipe fitting cylinder is hung down through a valve chamber having an upward step on the outer periphery of the upper end and a tapered valve seat having a lower inner diameter forming the lower surface of the valve chamber, and the inner surface of the upper end of the valve chamber is formed. A plurality of ball valve pull-out preventing ridges are provided and injection molding is performed integrally with an elastic synthetic resin material such as polyethylene.

[Problems to be Solved by the Invention] The valve chamber in the cylinder member is formed by extracting a rod-shaped mold together with the inner surface of the cylinder part. Even when the protrusion for preventing valve withdrawal is enlarged, as shown in FIG. 8, the inner surface of each of the protrusions 10 is deformed into a shape in which it is pulled upward when the rod-shaped mold is withdrawn, so that the cylinder When the member is used, as indicated by the two-dot chain line, the ball valve 9 in the valve chamber 7 is sandwiched between the inner surfaces of the ridges by being pushed up by the suction liquid, so that seating on the valve seat 6 becomes impossible. In some cases, it did not work as a suction valve. In this way, a ridge for preventing the extraction of the ball valve is attached to the inner surface of the upper part of the valve chamber,
Moreover, since it is difficult to easily form the cylinder member by removing the rod-shaped mold, a washer-shaped member or the like having an inner diameter smaller than the diameter of the valve chamber and the diameter of the ball valve may be placed on the upper end surface of the valve chamber. It is conceivable, however, that this is not appropriate because the cost increases due to an increase in the number of parts.

The present invention proposes a method of forming a valve chamber capable of reliably preventing the ball valve from being pulled out without increasing the number of parts.

(Means for Solving the Problems) (1) The liquid is sucked from the lower end of the inner surface of the cylinder through a valve chamber having an upward step on the outer periphery of the upper end and a tapered valve seat having a lower small inner diameter forming the lower surface of the valve chamber. The cylinder member for a liquid ejector, in which a fitting cylinder for a lifting pipe is hung down, and an upper end protruding upward from a step portion on the inner surface of an upper end portion of the valve chamber and provided with several projections for preventing ball valve withdrawal, is made of polyethylene or the like. After injection molding with an elastic synthetic resin material, a ball valve having substantially the same diameter as the inner circle formed by the inner surface of the ridge is loosely fitted into the valve chamber, and then the lower end surface of the rod inserted into the cylinder portion. By the lowering, the inner circle formed by the upper inner surface of each ridge is formed to have a smaller diameter than the inner circle formed by the lower inner surface of each ridge.

(2) The fitting cylinder for the liquid suction pipe is hung from the lower end of the inner surface of the cylinder through the valve chamber having an upwardly stepped portion on the outer periphery of the upper end and the tapered valve seat having the lower small inner diameter forming the lower surface of the valve chamber. Injection molding of a cylinder member for a liquid ejector having an upper end protruding upward from a stepped portion on the inner surface of the upper end of the valve chamber and having several projections for preventing ball valve withdrawal from an elastic synthetic resin material such as polyethylene. After that, a ball valve having substantially the same diameter as the inner circle formed by the inner surface of the ridge is loosely fitted into the valve chamber, and is then inserted into the cylinder portion. A groove having a V-shaped cross section is circumferentially formed in the upwardly-facing step by the rod push-down having the above, and the inner diameter of the upper end portion of the valve chamber is formed to be smaller than the inner diameter of the lower part of the valve chamber.

[Operation] As shown in FIG. 1, the inner circle 1 formed by the inner surface of each ridge 10 on the upper inner surface of the valve chamber 7 formed by the method of the present invention is:
Because it can be very short compared to the ball valve diameter,
The ball does not bite between the ridges.

Embodiment First, a cylinder member 1 formed by an embodiment of the method of the present invention shown in FIG. 1 will be described.
An outward flange 3 is attached to the upper end, and a suction pipe 4 fitting tube 5 is suspended from the lower end of the cylinder portion. The lower end of the cylinder portion is formed in a tapered portion with a small diameter below,
A valve chamber 7 having a bottom surface having a tapered valve seat 6 having a small diameter at the bottom is formed in the inside thereof, and the lower end of the valve seat communicates with the suction pipe 4 as a valve hole 8. At the upper end of the inner surface of the valve chamber, several ball valves 9 are provided with ridges 10 for preventing withdrawal.
The inner circle 1 formed by the inner side surface 10 is formed to be shorter than the diameter of the ball valve 9 loosely fitted in the valve chamber 7, and therefore, as shown by a two-dot chain line in FIG. There is no danger that the ball valve will bite into it. The outer periphery of the upper end of the valve chamber 7 is a step facing upward and downward.
11 and an upwardly-facing step 12 is formed on the outer periphery of the upper end of the step, the upright wall 13 is extended from the outer periphery of the step, and the curved wall 14 is further expanded upward and outward from the upper end of the wall. Connect to the lower end of the inner wall of the cylinder.

2 to 5 show a method of forming the cylinder member 1 having the above configuration.

FIG. 2 shows a structure as a design drawing, which is almost the same as the case of FIG. 1 described above.
As in the case of the figure, the upper and lower portions are not formed in two upper and lower steps, but in a single upward step 11a. The inner circle formed by the inner surface of each ball valve pull-out preventing ridge 10 is slightly larger in diameter than in FIG.

When the cylinder member having the structure shown in FIG. 2 is integrally formed with a commonly used elastic synthetic resin material such as polyethylene using a rod-shaped die for internal shape, the rod-shaped die is pulled out as shown in FIG. A cylinder member having an upper protruding portion 10a having a shape in which the inner portion of the protruding ridge 10 for pulling out the ball valve is pulled upward is formed. This is because the protrusion is deformed in order to forcibly pull out the rod-shaped mold, regardless of the outer diameter of the portion of the valve-mold wall surface 7a formed below the protrusion of the rod-shaped mold being larger than the inner circle. Caused by

Then, as shown in FIG. 4, after the ball valve 9 is put into the valve chamber 7, the rod 15 is pushed into the cylinder member 1 in FIG. While pushing down the portion 10a, the inner peripheral portion of the upward step portion 11a is also pushed up so strongly that it does not elastically recover. In this manner, as shown in FIG. 5, the cylinder member shown in FIG. 1 can be formed. The pushing down by the rod 15 is
Almost the entire upward step 11a may be pushed down, and
Alternatively, only the upper surface of each may be pushed down. The rod may be heated to facilitate the deformation.

6 and 7, a rod having a V-shaped cross section 16 is provided around the lower end of the rod.
By pressing down at 15, a V-shaped groove 17 may be formed in the upward stepped portion 11a. In this manner, the entire inner periphery of the upper end portion of the valve chamber 7 forms a tapered portion having an upper small inner diameter, and each of the inner side surfaces of the upper ridges 10a of FIG. Since a small-diameter inner surface circle is formed, the ball valve 9 is reliably prevented from being pulled out.

In the illustrated example, the inner diameter of the valve chamber 7 is set to be larger than the diameter of the ball valve so that the liquid is sucked up into the cylinder portion through the space between the wall surface of the valve chamber and the outer surface of the ball valve. It may be formed so that the liquid can be sucked up through the inside of the vertical groove. In this case, the gap between the outer surface of the ball valve and the wall surface of the valve chamber can be made smaller than in the illustrated example.

[Effects of the Invention] Since the present invention has the above-described configuration, it is not necessary to mount another member such as a washer-shaped member on the upward step on the valve chamber 7,
In addition, injection molding of the cylinder member is performed in the same manner as before, and the ball valve 9 is loosely fitted into the valve chamber. The ball valve 9 may be sandwiched between the inner surfaces of the ridges when the liquid is sucked up by merely shaping the diameter to be smaller than the inner circle formed by the lower inner side surface, and the seating on the valve seat 6 may not be possible. Not at all. Also, in the case of the second aspect, an upward step portion above the valve chamber 7.
At 11a, a rod 15 having a downward blade 16 having a V-shaped cross section is pushed down on the outer periphery of the lower end surface, and a groove having a V-shaped cross section is formed at the upward step.
By simply circulating the 17, the above-mentioned ball valve is not sandwiched between the ridges 10... And cannot be seated on the valve seat 6 at all, and therefore, a cylinder member having a suction valve function can be formed very easily. I can do it.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a cylinder member formed by the method of the present invention, FIGS. 2 to 5 are enlarged sectional views of essential parts showing the order of forming the cylinder member, and FIGS. 6 and 7 are second embodiment. And FIG. 8 is a sectional view of a cylinder member formed by a conventional method, showing the order of forming cylinder members according to the method of the present invention. DESCRIPTION OF SYMBOLS 1 ... Cylinder member, 6 ... Tapered valve seat 7 ... Valve chamber, 9 ... Ball valve 10 ... Protrusion, 11a ... Upward stepped part 15 ... Rod, 17 ... V-shaped groove

Claims (2)

(57) [Claims] 1. A fitting cylinder for a liquid suction pipe is provided from a lower end of an inner surface of a cylinder portion through a valve chamber having an upwardly stepped portion on the outer periphery of an upper end and a tapered valve seat having a lower small inner diameter forming a lower surface of the valve chamber. A cylinder member for a liquid ejector, which is drooping and has several ball valve pull-out preventing ridges protruding upward from the stepped portion on the inner surface of the upper end of the valve chamber and made of an elastic synthetic resin material such as polyethylene. After the injection molding, a ball valve having substantially the same diameter as the inner circle formed by the inner surface of the ridge is loosely fitted into the valve chamber, and then the lower end surface of the rod inserted into the cylinder portion lowers the lower portion of each of the ridges. A method of forming a valve chamber of a cylinder member for a liquid ejector, wherein an inner circle formed by an inner surface of an upper end portion is formed to have a smaller diameter than an inner circle formed by an inner surface of a lower portion of each protrusion. 2. A liquid suction pipe fitting cylinder is suspended from a lower end of an inner surface of a cylinder portion through a valve chamber having an upwardly stepped portion on the outer periphery of an upper end and a tapered valve seat having a small inside diameter forming a lower surface of the valve chamber. Injecting a cylinder member for a liquid ejector having an upper end protruding upward from a stepped portion on the inner surface of the upper end of the valve chamber and having several protrusions for preventing ball valve withdrawal, using an elastic synthetic resin material such as polyethylene. After molding, a ball valve having approximately the same diameter as the inner circle formed by the inner surface of the ridge is loosely fitted into the valve chamber,
Next, a groove having a V-shaped cross section is provided in the upwardly-facing step by pushing down a rod having a V-shaped downward blade on the outer periphery of the lower end face inserted into the cylinder section. A method for forming a valve chamber of a cylinder member for a liquid ejector, wherein the inner diameter of the upper end of the chamber is formed to be smaller than the inner diameter of the lower part of the valve chamber.